Glower for electric lamps.



UNITED STATES WALTHER NERNST, F e6 WESTINGHOUSE,

TTINGEhi"; GERM or PITTSBURG. PEN

PATENT FFICE.

ASSIGNOR 'TO GEORGE N S YLVANI A ANY,

GLOWER FOR ELECTRIC LAMPS.

SPEOIFIGAQION forming part of Letters Patent No. Application filed August 24, 1899. Renewed April 13, 1900- To all whom it may concern:

Be it knowmthat I, WAL'IHER NERNST, a, subject of the Emperor of Germany, residing in Gcttingen, Germany, have invented certain new ing is a specification.

The chief requirements for from materials which are u when colrhbutwhich becomec heated, are that they shall op siderable period with but iittl glowers formed erate for a con- 6 change in the em for actual 1i uring many hours of service. one ofthe mixtures which meets ments specified above in a high degree of completeness is one composed of about eighty parts of oxid of zirconium, about ten parts of oxid of erbium, and about ten parts of oxid c of yttrium.

My present i ments in electrghting purposes I find that the requirenvention r ic-lamp glo elates to improve were of the Nernst I 685,782, dated October 29, 1901. Serial No. 12,689. (No specimens.)

class, which consists in giving to such glowers approximately the composition above set forth.

The mannerin which 1 ing the constituent eleme eke about eighty par make a glower haw nts above set forth ts of the oxid of xids are first fully i-nding material is thoroughly mixed water is added to rs are then shaped composed, ap-

gust, 1899. p

- v W'ALTHER NERNST. Witnesses:

HENRY N our. POTTER, WOLDEMAR HAWT; 

